GMT 800 2500HD LQ4 Cam Input
12-07-2023, 05:59 PM
#41
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blackdak318 (12-08-2023)
12-08-2023, 11:15 AM
#42
I finished the LQ4 build about 2 months ago now. here's what I ended up doing...
stock crank, molnar forged rods, DSS forged pistons 3rd over, ported and softened 799 Heads, Summit 8720R1 Cam (218/227 112+2), BTR platinum 660 valve springs, tbss intake, 90mm 6.2 throttle body, 60lb injectors. lots of stuff (rods, pistons, crank, valve springs, rockers, timing gears, oil pump) was coated with micro slick to help with windage and heat. pistons and head where coated as well with piston cost for heat reduction.
final compression is around 10.6:1, currently running 93 open loop VE because I didn't feel like finishing the last bit of tuning until I got my headers on. I also have no clue about hp numbers but I saw a guy with an extremely similar build recently just less CR put down about 440wtq and 430whp. the thing will end up with a turbo at some point.
Still got a but of tuning to do just to button things up but it drives wonderfully. At first it would hit real hard right at 3500rpm but after some tuning it seems to hit just as hard at 3000rpm and still has tons of torque around 2500rpm. below that there has been a slight torque loss that's almost unoticeable. I think the headers I got will really help to spice things up down low.
stock crank, molnar forged rods, DSS forged pistons 3rd over, ported and softened 799 Heads, Summit 8720R1 Cam (218/227 112+2), BTR platinum 660 valve springs, tbss intake, 90mm 6.2 throttle body, 60lb injectors. lots of stuff (rods, pistons, crank, valve springs, rockers, timing gears, oil pump) was coated with micro slick to help with windage and heat. pistons and head where coated as well with piston cost for heat reduction.
final compression is around 10.6:1, currently running 93 open loop VE because I didn't feel like finishing the last bit of tuning until I got my headers on. I also have no clue about hp numbers but I saw a guy with an extremely similar build recently just less CR put down about 440wtq and 430whp. the thing will end up with a turbo at some point.
Still got a but of tuning to do just to button things up but it drives wonderfully. At first it would hit real hard right at 3500rpm but after some tuning it seems to hit just as hard at 3000rpm and still has tons of torque around 2500rpm. below that there has been a slight torque loss that's almost unoticeable. I think the headers I got will really help to spice things up down low.
Thanks for the info. I actually was never 100% happy with the TSP cam I got for cheap so I bought the Truck Norris on a 10% off black friday deal. Planning on running that. I agree headers make a huge difference down low. Holdener has a great video on it I just watched a few days ago. With stock manifolds the TN was well down on tq at 2500 rpm over the stock cam. But after adding in 1 3/4" longtubes and some section of exhaust it was back to nearly stock at 2500 and up on tq everything above that.